HMOs (Health Maintenance Organizations) are listed for free in WebMD Little Blue Book.   Because many HMO plans require referrals, prior authorizations, etc., the contact information is listed for the convenience of our readership. 

Other MCOs (Managed Care Organizations) are not listed in WebMD Little Blue Book because space is limited.

For HMOs, call Raphael Werner at 800-345-6865 x183 to confirm, update, or add your listing information.